The Star has allegedly been hiding the number of violent incidents that occur at the Sydney casino with almost two thirds of assaults going unreported.

A leaked NSW Department of Justice review into violence at the casino reveals the number of serious incidents at the premises are more than three times higher than official crime statistics and almost five times higher than reported to senior casino managers, the ABC reports.

Liquor and Gaming NSW inspectors found a number of violent incidents were classified as "behaviour" or "forced removals" in the casino's daily incident reports.

When the officials reviewed CCTV footage to check if the incidents had been misrepresented they allegedly found there were 111 violent incidents with police only called to 36 of them over a six-month period.

In one incident that went unreported a man had his leg broken during a melee at the Marquee nightclub.

While the incidents were routinely shared with Liquor and Gaming NSW, inspectors also found 79 percent of violent incidents were not included in a monthly report to casino executives, which is shared with the NSW government.

A casino expert told the ABC the data suggests around 250 assaults occur at The Star each year, a rate more than 10 times that of the most violent pub in NSW, the Plantation Hotel in Coffs Harbour, which recorded 21 incidents in 2015.

Related Articles

The review said it was concerned violent incidents were not reported to police and the result was that "statistical violent incident trends for the casino are not necessarily accurate".

The findings could threaten the casino's licence in the future with the review recommending a "crime scene preservation condition" that would include penalties for failing to report incidents to police.

On October 14 the state government sent a letter to the casino asking it to explain what measures it had taken to prevent violence on its premises.

A spokesman for The Star said the NSW government review was inaccurate due to a "misunderstanding of the incident reporting process at The Star".

"The report fails to address that NSW Police had an onsite presence at The Star between February and September 2015," he said.

"That onsite presence was subsequently removed. If police had any concerns, it is inconceivable that those resources would have been withdrawn."

He added that the casino is "the most highly-regulated licensed operator in NSW" and willingly shares confidential internal reports with state authorities.

He said The Star had also voluntarily implemented a program to combat alcohol-fuelled violence.